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Clapp JD, Beck GJ, Palyo SA, Grant DM.Clapp JD, et al. Among authors: palyo sa.Pain. 2008 Aug 31;138(2):301-309. doi: 10.1016/j.pain.2008.01.001. Epub 2008 Feb 14.Pain. 2008.PMID: 18280044Free PMC article.